ctrump/common/intmap.c

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/* -*- coding:utf-8 -*- 
 Copyright (c) 2009, Fixstars Corporation
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, 
 are permitted provided that the following conditions are met:
 
   * Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.
 
   * Redistributions in binary form must reproduce the above copyright notice,
     this list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.
 
   * Neither the name of Fixstars Corporation nor the names of its contributors
     may be used to endorse or promote products derived from this software
     without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "ctrump/common/intmap.h"
#include "ctrump/common/mempool.h"
#include <stdlib.h>

void
ctrump_intmap_init(struct ctrump_intmap *map,
                   int size)
{
    int i;
    map->size = size;
    map->buckets = malloc(sizeof(struct ctrump_intmap_bucket)*size);
    map->pool = NULL;

    for (i=0; i<size; i++) {
        map->buckets[i] = NULL;
    }
}


void
ctrump_intmap_init_pool(struct ctrump_intmap *map,
                        int size,
                        struct ctrump_mempool *pool)
{
    int i;
    map->size = size;
    map->buckets = ctrump_mempool_alloc(pool, sizeof(struct ctrump_intmap_bucket)*size);
    map->pool = pool;

    for (i=0; i<size; i++) {
        map->buckets[i] = NULL;
    }
}

static struct ctrump_intmap_bucket *
ctrump_intmap_lookup_impl(struct ctrump_intmap *map,
                          int *found,
                          unsigned int key,
                          int add)
{
    unsigned int idx = key%map->size;
    struct ctrump_intmap_bucket **pp, *p;

    pp = &map->buckets[idx];
    p = map->buckets[idx];

    while (p) {
        if (p->key == key) {
            *found = 1;
            return p;
        }
        pp = &p->chain;
        p = p->chain;
    }

    if (add) {
        if (map->pool) {
            p = ctrump_mempool_alloc(map->pool, sizeof(*p));
        } else {
            p = malloc(sizeof(*p));
        }

        *pp = p;
        p->chain = NULL;
        p->key = key;
    }

    *found = 0;

    return p;
}

struct ctrump_intmap_bucket *
ctrump_intmap_lookup_add(struct ctrump_intmap *map,
                         int *found,
                         unsigned int key)
{
    return ctrump_intmap_lookup_impl(map, found, key, 1);
}

void *
ctrump_intmap_lookup(struct ctrump_intmap *map,
                     int *found,
                     unsigned int key)
{
    struct ctrump_intmap_bucket *b;
    b = ctrump_intmap_lookup_impl(map, found, key, 0);

    if (b) 
        return b->val;

    return NULL;
}

struct ctrump_intmap_bucket *
ctrump_intmap_lookup_bucket(struct ctrump_intmap *map,
                            int *found,
                            unsigned int key)
{
    return ctrump_intmap_lookup_impl(map, found, key, 0);
}


static void
iter_next(struct ctrump_intmap_iterator *iter,
          struct ctrump_intmap *map,
          int begin)
{
    int i;
    int n = map->size;
    for (i=begin; i<n; i++) {
        if (map->buckets[i]) {
            iter->buckets_index = i;
            iter->next = map->buckets[i];
            return;
        }
    }

    iter->buckets_index = i;
    iter->next = NULL;
}

void
ctrump_intmap_iterator_begin(struct ctrump_intmap_iterator *iter,
                             struct ctrump_intmap *map)
{
    iter_next(iter, map, 0);
}

int
ctrump_intmap_iterator_next(struct ctrump_intmap_bucket **ret,
                            struct ctrump_intmap_iterator *iter,
                            struct ctrump_intmap *map)
{
    struct ctrump_intmap_bucket *b;
    if (iter->next == NULL) {
        iter_next(iter, map, iter->buckets_index+1);
        if (iter->buckets_index >= map->size)
            return 0;
    }

    b = iter->next;
    iter->next = b->chain;

    *ret = b;

    return 1;
}

int
ctrump_intmap_get_num_elem(struct ctrump_intmap *map)
{
    int s = map->size, i;
    int nelem = 0;
    for (i=0; i<s; i++) {
        struct ctrump_intmap_bucket *b;
        b = map->buckets[i];

        while (b) {
            nelem++;
            b = b->chain;
        }
    }

    return nelem;
}

static const int sizes[] = {
    5,
    17,
    41,
    79,
    149,
    251,
    421,
    683,
    1117,
    1823,
    2917,
    4679,
    7489,
    11867,
    18691,
    29443
};

#define NELEM(a) (sizeof(a)/sizeof(a[0]))

void
ctrump_intmap_resize_pool(struct ctrump_intmap *dest,
                          const struct ctrump_intmap *src,
                          struct ctrump_mempool *pool)
{
    int nelem = 0;
    int i, bi;
    unsigned int new_size;
    int s = src->size;
    struct ctrump_intmap_bucket *buckets;
    for (i=0; i<s; i++) {
        struct ctrump_intmap_bucket *b;
        b = src->buckets[i];

        while (b) {
            nelem++;
            b = b->chain;
        }
    }

    if (nelem > 29443) {
        new_size = nelem;
    } else {
        for (i=0; i<NELEM(sizes); i++) {
            new_size = sizes[i];
            if (new_size >= nelem)
                break;
        }
    }

    if (pool) {
        ctrump_intmap_init_pool(dest, new_size, pool);
        buckets = ctrump_mempool_alloc(pool, sizeof(struct ctrump_intmap_bucket)*nelem);
    } else {
        ctrump_intmap_init(dest, new_size);
        buckets = malloc(sizeof(struct ctrump_intmap_bucket)*nelem);
    }

    bi = 0;

    for (i=0; i<s; i++) {
        struct ctrump_intmap_bucket *b, *nb, *pb;
        b = src->buckets[i];

        while (b) {
            unsigned int k;
            nb = &buckets[bi];
            bi++;

            k = nb->key = b->key;
            nb->val = b->val;

            pb = dest->buckets[k%new_size];
            nb->chain = pb;
            dest->buckets[k%new_size] = nb;

            b = b->chain;
        }
    }
}

void
ctrump_intmap_free(struct ctrump_intmap *map)
{
    int i;
    int s = map->size;
    for (i=0; i<s; i++) {
        struct ctrump_intmap_bucket *b, *chain;
        b = map->buckets[i];

        while (b) {
            chain = b->chain;
            free(b);
            b = chain;
        }
    }

    free(map->buckets);
}

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